Finding the Fourth Proportional to 1,039.37, 1,559.52 and 491.94

Step by Step Solution

1. Step 1: Write the proportion equation
   1,039.37 : 1,559.52 = 491.94 : x
2. Step 2: Convert to fraction form
   1,039.37/1,559.52 = 491.94/x
3. Step 3: Cross multiply
   1,039.37x = 1,559.52 × 491.94
4. Step 4: Simplify right side
   1,039.37x = 767,190.27
5. Step 5: Solve for x
   x = 767,190.27/1,039.37
6. Step 6: Final answer
   x = 738.13